Balancing-ring.



C. O. BERGSTROM.

BALANCING RING.

I APPLICATION FILED Aue.12,191-2.

Patented July 18, 1916.

miizesses o The present inventionrelates to balancing .rings,

' abalancing ring which is capable of nice ad- I UNITED STATES, PATENT torsion.

C'ARL o. nnnesrnomor BOSTON, MASSAC COMPANY, or nos'ron, MAssAonUsErr ranimoine-nina.

To all whom it may concern:

Be it known that I, CARL' O. BERGSTROM, a. citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain'new and useful Improvements in Balancing- Rings; and I do hereby'declare the follow: ing to be a full, clear, and exact'description' of the invention, such as will enable others skilled in the art to which it appertaihs to make and use the same.

andmore particularly to balancing rings for high speed machines, such as high speed electric motors or generators.

The object of the invention is to produce justm'ents, in which the parts are firmly and compactly held together and which is eco-.

nomical to manufacture.

With the above object in view, the present invention consists in the improvements in balancing rings' hereinafter described and particularly pointed out in the claims. r In the drawings which illustrate the preferred embodiment of theinvention, Figure l'lS an end view of the balancing ring; and

Fig.2 is a section taken on the line 2+2 of Fig. -1.

- 'e body of the balancing ring consists of an unbroken, one-piece ring 64 which is fitted over the rotating part to be balanced and is rigidly secured thereto, preferably by heating the ring 64 and? shrinking it in place.

' In the side of the ring 64 is an annular, un.-

dercut slot 66 of a substantially trapezoidal cross section. Balancing pieces 72 and 74 are arranged to be fitted in the slot 66.

These balancing pieces are of arcuate shape and each subtends an angleof about 90 degrees. Each balancing piece 7 2 is of a substantially trapezoidal orosssection bein'gtapered opposite tothe tapering of the trapezoidal cross section of the groove 66. Each balancing piece 7 4 is of a substantially. rhomboidal cross section. The balancing pieces 72 and 74 are of such size and shape that when they are placed side by side they completely fill, the section of the groove 66 which they occupy. The balancing pieces 72 and 74: are inserted in the groove 66 by placing them in'the groove substantially end to end and then sliding them together until they lie side by side In order to clamp the balanc-' ing pieces 7 2 and 7A firmly in place, screws nosn'rrs, Assienon To a. r. STURTEVANT s, A conronnr ron or MASSACHUSETTS.

Specification of Lttersla'tent. t t July 13, 1916, Application filed August 12, 1912. Serial No. 714,618. A

76 are threaded through the pieces 72 and are arranged to be turned against the bottom of the groove 66 to force the balancing pieces '7 2-outward like a wedge between the walls of the groove and the other'balancing pieces 74:. As each. ring 64 is a solid ring and the balancing pieces are firmly wedged in an under-cut groove in its side, the composite ring 60 is capable of withstanding the severest conditions of vibration and rapid rotation. As shown in Fig 1, there are two sets of balancing pieces. When these two sets'of balancing pieces are located in the slot 66 diametrically opposite, the ring is balanced.- If the rotating part to which the present invention has been specifically illus-' trated and described, the present invention is not limited to the construction constituting its preferred embodiment, but. may be embodied in other constructions within the scope of the invention as defined in the following claims:

.1. A balancing ring having, in combination, a metal ring having an undercut groove, arc'uate balancing pieces fitted side by side to completely fill a section of the groove, and means for clamping thebalancing pieces in the groove, substantially as described.

2. A balancing ring having, in combination, a metal ring having an undercut groove of substantially trapezoidal cross section, an arcuate balancing piece of substantially trapezoidal cross section adapted to be received in the groove, a second arcuate balancing piece of substantially rhomboidal cross section arranged to be fitted beside the first balancing piece to completely fill a sec-.

- 3. A balancing ring havingfin combination, a metal ring having in its side an undercut gnoove ofsubstantially;trapezoidal cross section, an arcuate balancing piece of substantially trapezoidal cross section adapted to bereceivedin the groove, a second arcuate 1Q0 tion of the groove, substantiallyasdescribed.

balancing piece of substantially rhomboidal cross section arranged to be fitted beside the first balancing piece to completely-fill a sec- .tipnof the groove, and means for Wedging I tion a metal ring havingin its side an un-I der-cut grome of substantially trapezoidal cross section, an arcuatebalancing piece of substantially trapezoidal cross section adapted to be received in the groove, a second arcuate balancing piece of substantially rhomboidal cross section arranged to be fitted beside the first balancing piece tocompletely fill asection of the groove and retain the first balancing piece in. place, and a clamping screw in the first balancing piece arrangedto be turned against the bottom of the groove to force the first balancing piece outward and Wedge the two balancing pieces in place, substantially as described.

CARL O. BERGSTROM.

Witnesses:

GEORGE E. STEBBINS, MIRIAM CLEMENT. 

